Indentation with two materials: convergence problems
Indentation with two materials: convergence problems
(OP)
I want to model an indentation. The part wich is indented by a punch is made of two materials with different yield stress. I noted that when I use the values 376 and 200 MPa for Yield Stress everything is ok. But if I choose 376 and 110 MPa the job is aborted because of convergence problems. It happens in the final part of the job.
I think It has something to do with the difference between the values. Am I right?
Does anybody know how I can solve this?
Thanks in advance,
BRA
I think It has something to do with the difference between the values. Am I right?
Does anybody know how I can solve this?
Thanks in advance,
BRA





RE: Indentation with two materials: convergence problems
MRG
http://www.analysis.demon.co.uk
RE: Indentation with two materials: convergence problems
Thanks for your attention. I looked at my .msg file and I think the error is because the displacement problems. The last increment reports this:
THE MOMENT EQUILIBRIUM EQUATIONS HAVE CONVERGED
DISP. CORRECTION TOO LARGE COMPARED TO DISP. INCREMENT
This message repeats during 5 interations and the job is aborted. I have started using abaqus few weeks ago and I'm using abaqus CAE. Could you tell me how can I relax the convergence tolerances?
Thanks in advance,
BRA
RE: Indentation with two materials: convergence problems
harry
RE: Indentation with two materials: convergence problems
*CONTROLS, PARAMETERS=FIELD, FIELD=DISPLACEMENT
** R_n^alpha C_n^alpha q_0^alpha q_n^aplha R_p^alpha eps^alpha
, 0.10 , , ,
btw, does ABAQUS report nodes going in and out of contact? Also, try restricting the maximum size of the increment:
*STATIC
** init'l time period min. max.
** time of step time time
0.01 , 1.00 , 1.0E-6 , 0.05
MRG
http://www.analysis.demon.co.uk
RE: Indentation with two materials: convergence problems
harry